When the error occurs, check the Queue Viewer, see what is reported in the Last Error column.

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ucguyAuthor Commented: 2014-11-09

hi adam,

I get below error on Queue.

""451.4.4.0 Primary target IP address
responded with 454.4.7.0 Temporary Authentication failure. " Attempted
failover at alternate host, but that did not succeed. Either there no alternate
hosts, or delivery failed to all alternate hosts"